The deficit is the difference between how much money the government takes in through taxes and how much it spends each year. The public debt is the same as the national debt, and it's the accumulation of all of the deficit, plus any other money the government spent that wasn't part of the budget. The United States public debt is currently well over $9 trillion. (You can look up the exact public debt at the U.S. Bureau of Public Debt.) In 2006, the interest alone on the national debt cost U.S. taxpayers $405 billion [source: CBS News].
The total public debt is actually divided into two categories: the debt held by the public and intragovernmental holdings. According to MSNBC, here's how the debt held by the public works:
- To raise money, the federal government auctions off treasury securities to domestic and foreign investors. These could be U.S. Savings Bonds or Treasury Bills (T-Bills) or other notes.
- During the auction process, investors bid for securities in two different ways: competitive or non-competitive bids. To make a competitive bid, investors state the interest rate at which they're willing to buy the security. For a non-competitive bid, investors agree to purchase the security at the average interest rate of all bids.
- The government sells enough securities at each auction to satisfy a certain spending goal, like $18 billion. It starts by selling to the lowest bidder and work its way up until the stated goal is reached.
- But at some point the investor will cash in those securities along with any interest that's accrued over time. The debt held by the public -- currently $5 trillion -- is the total amount that's owed to all of these investors at any given time.
Intragovernmental holdings -- the other $4 trillion -- are treasury securities that the U.S. government buys itself to bolster huge federal savings programs like Social Security, Medicare and Medicaid.
Obviously, the United States is not alone in holding a large national debt. But a better indicator of a nation's indebtedness is the ratio of its public debt to its GDP, or total national income. The U.S. public debt ratio in 2005 was calculated as 61.8 percent of the GDP. In the same year, the UK's ratio was 46.7 percent, France's was 76.1 percent and Japan's was an astonishing 173.1 percent [source: OECD].
But how does the public debt affect the economy as a whole? Is a large public debt an indicator of bad economic times to come? The United States Government Accountability Office (GAO), says that a rising national debt, particularly when viewed as a percentage of a nation's GDP, is a big problem, although a long-term one.
The GAO explains that the more debt a country holds, the less money it's able to put away in savings and reinvest in the nation's economy. In the United States, in particular, the Social Security, Medicare and Medicaid savings accounts are going to be hit hard by the retirement of the Baby Boomers. The government will no longer be able to tap into these accounts to pay for other federal programs. The GAO also warns that federal borrowing to pay off the deficit will inevitably lead to higher interest rates, affecting the ability of citizens to buy homes and take out loans. That could lead to a broader economic slowdown, or even recession [source: GAO].
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